10505840509 has 4 divisors (see below), whose sum is σ = 10509418080. Its totient is φ = 10502262940.

The previous prime is 10505840507. The next prime is 10505840599. The reversal of 10505840509 is 90504850501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10505840509 - 2¹ = 10505840507 is a prime.

It is a super-2 number, since 2×10505840509² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10505840507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1784377 + ... + 1790254.

It is an arithmetic number, because the mean of its divisors is an integer number (2627354520).

Almost surely, 2^10505840509 is an apocalyptic number.

It is an amenable number.

10505840509 is a deficient number, since it is larger than the sum of its proper divisors (3577571).

10505840509 is an equidigital number, since it uses as much as digits as its factorization.

10505840509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3577570.

The product of its (nonzero) digits is 36000, while the sum is 37.

The spelling of 10505840509 in words is "ten billion, five hundred five million, eight hundred forty thousand, five hundred nine".